238 



Long. 2- poll., lat. 0-9 poll, alt. 0-9 poll. 

 Idem discrinieu inter juveniles et adultas testas inter- 

 cedit quod iu ph. calva Gray (Sow.) nr. 3. 

 Legit 11. Cuming ad Pananiam. 

 Proccedings. 1834. p. 70. 



5. Pholas melaimra G. B. Sowerhy. 



Ph. testa ovata, antice rotundata, postice obtusa, hiatu 

 mediocrij valvis fascia impressa transversim sulcata dimi- 

 diatis; areis, antica oblique divisa, parte postica dorsali ra- 

 diatini corrugata, parte antica ventrali tenuiore, inflata; 

 postica longitudinaliter slriata, postice epidermide nigra in- 

 duta; margiue dorsali antica inflato-rcflexa; valvis acces- 

 soriis dufibus, posticis, subtrigonis, superne fornicatis. 



Long. 1-4 polL, lat. 0-75 poll., alt. 08 poU. 



Legit H. Cuming ad montem Clmsti Columbiae occi- 

 dentalis. 



Proceedings. 1834. p. 70. 



6. Pholas tuhifera G. B. Sowerhy, 



Ph. testa oblonga, postice subattenuaia, subtrimcata, 

 antice rotundata; valvis fascia transversim sulcata dimidia- 

 tis; areis, antica oblique divisa, parte postica dorsali ra- 

 diatim sulcata, decussata, parte antica ventrali tenuiore, 

 subinflata; postica longitudinaliter striata; margine dorsali 

 antJca rcflexo-inflata; valvis accessoriis dorsalibus duabus, 

 postlcis, subovatis; epidermide postice in duas valvas pla- 

 iiulatas decurrente, deinde in tubuhnn calcareum ad extre- 

 mam partera conspicuum. 



Long. 1-3 poll., lat. 0-5 polL, alt. 0-45 polL 



Similis pli. papyraceae . . — Testa intermediae aeta- 

 iis tubulo caret. 



Legit H. Cuming ad sinum Caraccensem Columbiae oc- 

 cidentalis. 



Proceedings. 1834. p. 71. 



7. Pholas quadra 6r. jB. Sowerhy. 



Ph. testa oblonga, tenuissima, antice inflata, rotundata, 

 postice subattenuata , subtruncata; valvis fascia transversim 



